in common/src/main/java/deltix/connector/common/util/DefaultRequestValidator.java [60:69]
public void validateModify(final OrderReplaceRequest request) {
if (!fastReplaceAllowed && !request.hasExternalOrderId())
throw InvalidOrderStateException.CANT_MODIFY_UNACKNOWLEDGED_ORDER;
if (!displayQtyAllowed && request.hasDisplayQuantity())
throw new InvalidOrderException("Display quantity is not allowed");
if (!minQtyAllowed && request.hasMinQuantity())
throw new InvalidOrderException("Minimum quantity is not allowed");
}